public async Task<bool> AddToFavorite(Recipe r)
        {
            try
            {
                string json = JsonConvert.SerializeObject(r);
                HttpContent content = new StringContent(json, Encoding.UTF8, "application/json");
                HttpResponseMessage response = await client.PostAsync("api/recipes", content);
                if ((response.IsSuccessStatusCode) || (response.StatusCode.ToString().Equals("Conflict")))
                {
                    String recipeId = r.recipe_id + currentApp.GlobalInstance.userId;
                    UserFavorite uFav = new UserFavorite(recipeId, currentApp.GlobalInstance.userId, r.recipe_id);
                    string jsonfav = JsonConvert.SerializeObject(uFav);
                    HttpContent contentfav = new StringContent(jsonfav, Encoding.UTF8, "application/json");
                    HttpResponseMessage responsefav = await client.PostAsync("api/userfavorites", contentfav);
                    if (responsefav.IsSuccessStatusCode)
                    {
                        return true;
                    }
                    return false;
                }
            }
            catch (HttpRequestException e) {
                return false;
            }

            return false;
        }
        public async Task<bool> RemoveFavorite(Recipe r)
        {
            try
            {
                HttpResponseMessage response = await client.DeleteAsync("api/userfavorites/" + r.recipe_id + currentApp.GlobalInstance.userId);
                if (response.IsSuccessStatusCode)
                {
                    return true;
                }
            }
            catch (HttpRequestException e) {
                return false;
            }

            return false;
        }